The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2007
Filed:
Jan. 31, 2005
Makoto Iwasaki, Tokyo, JP;
Chikara Ishizaka, Tokyo, JP;
Taku Takeishi, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An R-T-B system rare earth sintered magnet having a high mechanical strength and excellent corrosion resistance is provided. The R-T-B system rare earth sintered magnet of the present invention comprises a sintered body comprising a main phase consisting of an RTB phase where R represents one or more rare earth elements and T represents one or more transition metal elements essentially containing Fe, or Fe and Co, and a grain boundary phase containing a higher amount of R than the above described main phase, wherein the surface of the above described sintered body is partially covered with a carbon compound layer. In the R-T-B system rare earth sintered magnet of the present invention, the area ratio of the partial surface of the above described sintered body covered with the above described carbon compound layer to the entire surface thereof is preferably between 10% and 90%.